IPad Safari Spontaneously clearing website data

I have a dozen ipad 2's that are setup using an HTML page for a time clock application.    This is not an app, but just a webpage.   The vendor uses the website data as some sort of registration code to let the HTML page know it's registered with the payroll company, and is a legit clock for staff to punch into.    When we register the clock, it puts an entry in the website data.    Anyway, we have had spontaneous instances where the website data gets cleared on it's own.    All these HTML "clocks" are locked down with Guided Access to prevent staff from exiting the HTML page so I know nobody is clearing the website data manually.   also, this happened one day to 12 of these IPad "clocks" all at once.    We have the IPads set to not perform any app or IOS updates automatically.   The IPads are running ISO 8.3 or 8.4.  

Does anyone know of a circumstance where an IPad/Safari will clear it's website data all by itself?
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Kyle SantosQuality AssuranceCommented:
I do not know of a circumstance where an iPad/Safari will clear it's own website data.  

I do know that Safari can be set in private browsing mode and won't go back to regular browsing mode until its manually changed.  Are your iPads all set for Private Browsing Mode by chance?  

For example,

Go to Safari.
At the top right, click the two overlapping squares.
Look at 'Private'.
Another place you can check Safari's settings is go to:
and check here if there is a setting made to clear history and website data.
jhunter9999Author Commented:
Good question, but no they are not set to private.   They collect the history of browsing.
Kyle SantosQuality AssuranceCommented:
It doesn't sound like its iPad related, but just in case, have you tried using a different browser application?  Safari isn't the most reliable browser.  

Go to the Apple App Store and install Chrome browser.   Go to the HTML webpage and perform a time clock.  When you register the clock does it put an entry in the website data now?

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jhunter9999Author Commented:
Chrome is not technically supported by the payroll company supplying the webpage, but I have  test I Ipad in my office and I'm trying it anyway.    I have it side-by-side with an IE based clock so I'm watching how each of them does.

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